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#16
frax

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Thanks - I'll take a peek at those!
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#17
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Ok,

I managed to get something useful, but the workflow got kind of convoluted...
  • The original coordinates were lat/long
  • Brought these up in ArcMap and projected these
  • Used the disperse markers to prevent overlap
  • Exported the representation to the actual data
  • Got the new x/y coords in the projected coordinate system (after dispersion) and added them as attributes (using Hawth's tools)
  • Did some magic in MS Access using the above attributes + the network data to get a table of: fromx, fromy, tox, toy, flow unit
  • Then used the NodeXML template for Excel to play with this data, and to get nice vertices/edges (network mapping lingo)
  • Recalculated the x/y coords so that they were within 0-90
  • Exported from NodeXML as graphml and opened this up in Gephi
  • In Gephi I ran a geo-plugin to map these coordinates in a fake equirectangular coordinate space
  • Exported as SVG from Gephi
  • Bringing the resulting svg linework into my illustration and aligning it
  • Final touchup in Illustrator
  • the exported svg keeps the direction of the flows, I could use this in Illy to illustrator the direction of the arrows using art brushes (gray-color)
  • In the resulting map, the color + width of the line displays the magnitude (five classes) in the unit of the flow.

NodeXML is a template for Excel that has come out of Microsoft Research recently, I was more home in editing and playing with the data there, rather than Gephi (which has a funky user interface). Unfortunately NodeXML doesn't support exporting to any vector format (nor the nice arcs that I got out of Gephi). http://nodexl.codeplex.com/

Attached Files


Hugo Ahlenius
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#18
frax

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Wow, amazing that I had noted down all those steps - I had to redo this analysis/map again now, and I had not kept any notes on it around - but then I remembered that I had posted on CartoTalk about it, and here it was!

Quite a lot of steps, but straightforward when I started to set it up again... !
Hugo Ahlenius
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#19
a0r

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Wow, amazing that I had noted down all those steps - I had to redo this analysis/map again now, and I had not kept any notes on it around - but then I remembered that I had posted on CartoTalk about it, and here it was!

Quite a lot of steps, but straightforward when I started to set it up again... !


Does that mean you have new product? Can we see?! This stuff is really great, I'd like to give it a shot sometime, but... not right now.

#20
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I do have a new one, see below. It is still a work in progress though, waiting for feedback from the client...
Attached File  north2north_dec2012.jpg   25.17KB   40 downloads
Hugo Ahlenius
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#21
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Very cool, thanks for sharing!

#22
Fran├žois Goulet

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Hi - there is no requirement that the lines should be realistic. They are not really travels - they represent exchanges between universities around the Arctic, so the actual travels would be routed elsewhere.

 

I wrote a python script that creates arcs from point A to point B...

 

http://blog.fgcartog...-python-script/

 

Could help...






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